In a single exposure, astronomers were able to confirm the existence of a supermassive black hole in the center of galaxy M84. They did this by using the Hubble Space Telescope’s more powerful spectrograph to map the rapid rotation of gas at the galaxy’s center. The colorful zigzag provides the evidence. If no black hole were present, the line would be nearly vertical.
This image was originally released May 12, 1997.
Supermassive Black Hole